Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

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  */

 // This file contains the platform-independent parts

 // of the interpreter and the interpreter generator.

 //------------------------------------------------------------------------------------------------------------------------

 // An InterpreterCodelet is a piece of interpreter code. All

 // interpreter code is generated into little codelets which

 // contain extra information for debugging and printing purposes.

 class InterpreterCodelet: public Stub {

   friend class VMStructs;

  private:

   int         _size;                             // the size in bytes

   const char* _description;                      // a description of the codelet, for debugging & printing

   Bytecodes::Code _bytecode;                     // associated bytecode if any

  public:

   // Initialization/finalization

   void    initialize(int size)                   { _size = size; }

   void    finalize()                             { ShouldNotCallThis(); }

   // General info/converters

   int     size() const                           { return _size; }

   static  int code_size_to_size(int code_size)   { return round_to(sizeof(InterpreterCodelet), CodeEntryAlignment) + code_size; }

   // Code info

   address code_begin() const                     { return (address)this + round_to(sizeof(InterpreterCodelet), CodeEntryAlignment); }

   address code_end() const                       { return (address)this + size(); }

   // Debugging

   void    verify();

   void    print_on(outputStream* st) const;

   void    print() const { print_on(tty); }

   // Interpreter-specific initialization

   void    initialize(const char* description, Bytecodes::Code bytecode);

   // Interpreter-specific attributes

   int         code_size() const                  { return code_end() - code_begin(); }

   const char* description() const                { return _description; }

   Bytecodes::Code bytecode() const               { return _bytecode; }

 };

 // Define a prototype interface

 DEF_STUB_INTERFACE(InterpreterCodelet);

 //------------------------------------------------------------------------------------------------------------------------

 // A CodeletMark serves as an automatic creator/initializer for Codelets

 // (As a subclass of ResourceMark it automatically GC's the allocated

 // code buffer and assemblers).

 class CodeletMark: ResourceMark {

  private:

   InterpreterCodelet*         _clet;

   InterpreterMacroAssembler** _masm;

   CodeBuffer                  _cb;

   int codelet_size() {

     // Request the whole code buffer (minus a little for alignment).

     // The commit call below trims it back for each codelet.

     int codelet_size = AbstractInterpreter::code()->available_space() - 2*K;

     // Guarantee there's a little bit of code space left.

     guarantee (codelet_size > 0 && (size_t)codelet_size >  2*K,

                "not enough space for interpreter generation");

     return codelet_size;

   }

  public:

   CodeletMark(

     InterpreterMacroAssembler*& masm,

     const char* description,

     Bytecodes::Code bytecode = Bytecodes::_illegal):

     _clet((InterpreterCodelet*)AbstractInterpreter::code()->request(codelet_size())),

     _cb(_clet->code_begin(), _clet->code_size())

   { // request all space (add some slack for Codelet data)

     assert (_clet != NULL, "we checked not enough space already");

     // initialize Codelet attributes

     _clet->initialize(description, bytecode);

     // create assembler for code generation

     masm  = new InterpreterMacroAssembler(&_cb);

     _masm = &masm;

   }

   ~CodeletMark() {

     // align so printing shows nop's instead of random code at the end (Codelets are aligned)

     (*_masm)->align(wordSize);

     // make sure all code is in code buffer

     (*_masm)->flush();

     // commit Codelet

     AbstractInterpreter::code()->commit((*_masm)->code()->pure_insts_size());

     // make sure nobody can use _masm outside a CodeletMark lifespan

     *_masm = NULL;

   }

 };

 // Wrapper classes to produce Interpreter/InterpreterGenerator from either

 // the c++ interpreter or the template interpreter.

 class Interpreter: public CC_INTERP_ONLY(CppInterpreter) NOT_CC_INTERP(TemplateInterpreter) {

   public:

   // Debugging/printing

   static InterpreterCodelet* codelet_containing(address pc)     { return (InterpreterCodelet*)_code->stub_containing(pc); }

 #include "incls/_interpreter_pd.hpp.incl"

 };